<div class="tracker" id="t_{{=$viewId}}" mx-click="@:{update.range}()">
    {{if buffer}}
    <div class="buffer" style="width:{{=bufferValue*100}}%"></div>
    {{/if}}
    <div class="passed" style="width:{{=value*100}}%"></div>
</div>
<div class="pointer" style="left:{{=value*100}}%" mx-mousedown="@:{start.drag}()"></div>